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TPS6507x input source for SYS voltage
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Q: TPS6507x input source for SYS voltage by 479615
question regarding the TPS650732 datasheet. Would you please answer question as follows?
1. Datasheet p34(Figure 33): When the TPS650732 status changes from "Power OFF/SYS=0" to "Power OFF/SYS=1" and /PB_IN goes 1 to 0, where is SYS voltage applied? The datasheet stated that the condition is "voltage at AC or USB "or" /PB_IN=0. *Voltage is applied at both of AC-pin and USB-pin.
2. At the above status changes, and no voltage is applied at AC-pin and USB-pin, does SYS voltage be applied from BAT? If yes, does it need any sequence?
Please let me know, if you have any question.
Your support would be mich appreciated.
Q: Re: TPS6507x input source for SYS voltage by 1169162
please find answer embedded below.
The SYS voltage is the output of the power path. SYS is supplied either from AC, USB (if present) or BAT.
If AC, USB and BAT are present, priorit is given to AC input.
2nd USB, 3rd BAT.
As soon as AC or USB are applied the SYS voltage will ramp up.
Yes if AC and USB are not present SYS is supplied by BAT. In case the device is supplied for BAT, PB_IN needs to be pulled low in order to transition from <POWER OFF, SYS OFF> status to <POWER OFF2, SYS ON> status.
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